Encrypted Media: Use uint32 for systemCode in SessionError.

content/renderer/media/webmediaplayer_impl.cc

Index: content/renderer/media/webmediaplayer_impl.cc
diff --git a/content/renderer/media/webmediaplayer_impl.cc b/content/renderer/media/webmediaplayer_impl.cc
index 411b814757cd4c0f737f2fb995bd249ecee8962f..b11a21f20e1f3a7be3f8c3ba995e54f199a0d731 100644
--- a/content/renderer/media/webmediaplayer_impl.cc
+++ b/content/renderer/media/webmediaplayer_impl.cc
@@ -1062,17 +1062,25 @@ void WebMediaPlayerImpl::OnAddTextTrack(
 
 void WebMediaPlayerImpl::OnKeyError(const std::string& session_id,
                                     media::MediaKeys::KeyError error_code,
-                                    int system_code) {
+                                    uint32 system_code) {
   DCHECK(main_loop_->BelongsToCurrentThread());
 
   EmeUMAHistogramEnumeration(current_key_system_, "KeyError",
                              error_code, media::MediaKeys::kMaxKeyError);
 
+  unsigned short short_system_code = 0;
+  if (system_code > std::numeric_limits<unsigned short>::max()) {
+    LOG(WARNING) << "system_code exceeds unsigned short limit.";
+    short_system_code = std::numeric_limits<unsigned short>::max();
+  } else {
+    short_system_code = static_cast<unsigned short>(system_code);
+  }
+
   client_->keyError(
       WebString::fromUTF8(GetPrefixedKeySystemName(current_key_system_)),
       WebString::fromUTF8(session_id),
       static_cast<blink::WebMediaPlayerClient::MediaKeyErrorCode>(error_code),
-      system_code);
+      short_system_code);
 }
 
 void WebMediaPlayerImpl::OnKeyMessage(const std::string& session_id,